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What is the operating sequence for the HV circuit breakers ?

Published date: 20 January 2020

The operating sequences are required by IEC 62271-100.
The circuit breakers can operate with the 3 operating sequences mentioned in the catalogue.

The short circuit breaking and making tests and the mechanical tests (M2 class) have been performed with the operating sequence “O-0.3s-CO-15s-CO”
It is the “fast” operating sequence, the most severe from IEC standard.

So, the circuit breaker can also performed the two other operating sequences in accordance (see below)
It is not an option or something special.
The time between O/C is adjusted by relay, Sepam or other according to customer needs.

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